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natali 33 [55]
3 years ago
11

The sum of three times a number and 10 is 31.Find the number.

Mathematics
1 answer:
olga55 [171]3 years ago
4 0

Answer:

7

Step-by-step explanation:

Let the number be n.

3n+10=31

Subtract 10 from both sides:

3n+10-10=31-10

3n=21

Divide both sides by 3:

\frac{3n}{3}=\frac{21}{3}

n=7

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Step-by-step explanation:

With the information provided you know that Jay had 6 times as much money as Kay wich can be expressed as:

J=6K, where

J is the money Jay had

K is the money Kay had

Also, you know that  Jay gave Kay $33 and Jay now has twice as much money as Kay, which would be:

J-33=2(K+33)

Now, you can replace J=6K in this equation and solve for K:

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Then, you can replace the value of K in J=6K:

J=6*24.75

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According to this, the answer is that Jay started with $148.5 and Kay with $24.75.

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